<template>
    <div>
        <h1>{{ message }}</h1>
        <button @click="btn">逆转世界</button>
    </div>
</template>

<script>
    export default {
        data() {
            return {
                message: "HELLO, WORLD",
            };
        },
        methods: {
            btn() {
                this.message = this.message.split("").reverse().join("")
            }
        }
    };
</script>